What is a CR?

What exactly is a CR? Could you possibly break it down for me? I've heard the term used in cryptocurrency circles, but I'm not entirely sure what it stands for or what its significance is. Is it related to a specific type of coin or token? Or is it more of a concept or technology within the broader realm of crypto? I'd really appreciate it if you could explain it in layman's terms, as I'm still relatively new to this space. Thank you!